Just bought a home half a year ago, fees came out to nowhere near 10%. It was just around 2% that came from my pocket, and the seller paid the rest, but even then I doubt they paid 8% to get that 10% figure they're suggesting.
I negotiated the purchase of my condo from our landlord. The first thing we did was shave 6% off from the avg price in the area due to not using real estate agents. That fee is an indirect amount you paid through an increased price.
There's much more than just agent fees to include in these costs. Title insurance. Closing. Mortgage origination fees. Etc.